what is convection ?
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the process in which heat moves through a gas or a liquid as the hotter part rises and the cooler, heavier part sinks
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ᴄᴏɴᴠᴇᴄᴛɪᴏɴ ɪs ᴀ ᴛʏᴘᴇ ᴏғ ʜᴇᴀᴛ ᴛʀᴀɴsғᴇʀ ᴛʜᴀᴛ ᴄᴀɴ ᴏɴʟʏ ʜᴀᴘᴘᴇɴ ɪɴ ʟɪϙᴜɪᴅs ᴀɴᴅ ɢᴀsᴇs, ʙᴇᴄᴀᴜsᴇ ɪᴛ ɪɴᴠᴏʟᴠᴇs ᴛʜᴏsᴇ ʟɪϙᴜɪᴅs ᴏʀ ɢᴀsᴇs ᴘʜʏsɪᴄᴀʟʟʏ ᴍᴏᴠɪɴɢ. ᴄᴏɴᴠᴇᴄᴛɪᴏɴ ʜᴀᴘᴘᴇɴs ᴡʜᴇɴ ᴛʜᴇʀᴇ ɪs ᴀ ᴅɪғғᴇʀᴇɴᴄᴇ ɪɴ ᴛᴇᴍᴘᴇʀᴀᴛᴜʀᴇ ʙᴇᴛᴡᴇᴇɴ ᴛᴡᴏ ᴘᴀʀᴛs ᴏғ ᴀ ʟɪϙᴜɪᴅ ᴏʀ ɢᴀs. ᴛʜᴇ ʜᴏᴛ ᴘᴀʀᴛ ᴏғ ᴀ ғʟᴜɪᴅ ʀɪsᴇs, ᴀɴᴅ ᴛʜᴇ ᴄᴏᴏʟᴇʀ ᴘᴀʀᴛ sɪɴᴋs
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